package com.shop.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class BaseDao {

	private static final String DRIVER = "com.mysql.jdbc.Driver";
	
	private static final String URL = "jdbc:mysql://localhost:3306/shop";
	
	private static final String USER = "root";
	
	private static final String PASSWORD = "123456";
	
	
	static {
		try {
			Class.forName(DRIVER);
		} catch (ClassNotFoundException e) {
			System.out.println("加载驱动失败");
			e.printStackTrace();
		}
	}
	
	public static Connection getCon() {
		Connection con = null;
		try {
			con = DriverManager.getConnection(URL, USER, PASSWORD);
		} catch (SQLException e) {
			System.out.println("请检查数据库连接，用户名和密码");
			e.printStackTrace();
		}
		return con;
	}
	
	public static void closeAll(ResultSet res,Statement stmt,Connection con) {
		if(res != null) {
			try {
				res.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		if(stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		if(con != null) {
			try {
				con.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	

}
